/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
Distributed under the Boost Software License, Version 1.0. (See accompanying | |
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
==============================================================================*/ | |
#if !defined(FUSION_SEQUENCE_FILTER_VIEW_HPP) | |
#define FUSION_SEQUENCE_FILTER_VIEW_HPP | |
#include <boost/fusion/support/detail/access.hpp> | |
#include <boost/fusion/support/sequence_base.hpp> | |
#include <boost/fusion/support/is_view.hpp> | |
#include <boost/fusion/view/filter_view/filter_view_iterator.hpp> | |
#include <boost/fusion/view/filter_view/detail/begin_impl.hpp> | |
#include <boost/fusion/view/filter_view/detail/end_impl.hpp> | |
#include <boost/fusion/view/filter_view/detail/size_impl.hpp> | |
#include <boost/fusion/sequence/intrinsic/begin.hpp> | |
#include <boost/fusion/sequence/intrinsic/end.hpp> | |
#include <boost/mpl/bool.hpp> | |
#include <boost/mpl/eval_if.hpp> | |
#include <boost/mpl/inherit.hpp> | |
#include <boost/mpl/identity.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct filter_view_tag; | |
struct forward_traversal_tag; | |
struct fusion_sequence_tag; | |
template <typename Sequence, typename Pred> | |
struct filter_view : sequence_base<filter_view<Sequence, Pred> > | |
{ | |
typedef filter_view_tag fusion_tag; | |
typedef fusion_sequence_tag tag; // this gets picked up by MPL | |
typedef typename | |
mpl::eval_if< | |
traits::is_associative<Sequence> | |
, mpl::inherit2<forward_traversal_tag,associative_tag> | |
, mpl::identity<forward_traversal_tag> | |
>::type | |
category; | |
typedef mpl::true_ is_view; | |
typedef typename result_of::begin<Sequence>::type first_type; | |
typedef typename result_of::end<Sequence>::type last_type; | |
typedef Pred pred_type; | |
filter_view(Sequence& in_seq) | |
: seq(in_seq) | |
{} | |
first_type first() const { return fusion::begin(seq); } | |
last_type last() const { return fusion::end(seq); } | |
typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq; | |
private: | |
// silence MSVC warning C4512: assignment operator could not be generated | |
filter_view& operator= (filter_view const&); | |
}; | |
}} | |
#endif | |